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The RS' top speed is the seventh-fastest at the lower end of the game's high-performance vehicles at 160 km/h (100 mph), however its acceleration is the fastest of any car in the game, and its handling is excellent. The Sultan RS is clearly a sports car tuned for asphalt racing, with hard suspension and low profile tires, making it difficult to drive off road, or on wet or uneven roads. It lacks ABS as is customary with many ultra-lightweight track cars. The brakes are powerful, bringing the vehicle from its top speed to a standstill complete stop in very short distances (unlike other sports cars).

The fastest car in GTA IV is the Infernus RS which is the rarest car in the game (rarer than the sultan RS) and noticed by it's appearance is the front is a Lamborghini Gallar…do LP560-4, the back like a Pagani Zonda F and the roof like a Maserati MC 12 Coupe.

no, only if you download a mod on the pc. in gta4 there are 3 car shops but with that in mind you can steal cars from those shops. you don't really need to buy one just steal …one and keep it outside your house then save it and it will stay there

There is a Sultan RS that respawns on GTA IV. This vehicle can be found well hidden behind the old garages/sheds in the grounds of the ruined mansion in Westdyke, Alderney. Th…is is the old mansion that Niko drives the hijacked van full of coke to for Phil Bell. It is in the north of Alderney and the track leading to the old house is just over the road from the Burger Shot there. Regarding the cars Niko has to find for Stevie (there are 30 of them), Stevie will text Niko with a location and photo of each vehicle. If you want more details of where the 30 are hidden, checkout a good GTA site: gtawiki